[R] labels and counting

dax42 Dax42 at web.de
Thu Dec 30 20:01:01 CET 2004


I have got the following problem:
given is a large string sequence consisting of the four letters "A" "C" 
"G" and "T" (as before). Additionally, I have got a second string 
sequence of the same length giving a label for each character. The 
labels are "+" and "-".

Now I would like to create an 8x8 matrix which contains the numbers on 
how often we see all possible pairwise combinations, for example "A" 
with the label "+" followed by "C" with the label "+" or "T"->"C" with 
the labels "-"->"+" etc.

Of course I can just use loops to "walk" along the sequence, but as you 
have shown me so much better solutions in response to my last mail, I 
thought you might be able to help and improve my R skills even further 

Thanks for your ideas!
Cheers, Winnie

More information about the R-help mailing list